Enum OptValue 

#[non_exhaustive]
pub enum OptValue {
    None,
    Optional,
    OptionalNonEmpty,
    Required,
    RequiredNonEmpty,
}

Option’s value type.

Usually used with OptSpecs::option method. Variants of this enum define if and how an option accepts a value.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

None

Option does not accept a value.

Optional

Option accepts an optional value.

OptionalNonEmpty

Option accepts an optional value but empty string is not considered a value.

Required

Option requires a value.

RequiredNonEmpty

Option requires a value but empty string is not considered a value.

Trait Implementations

impl Debug for OptValue

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for OptValue

fn eq(&self, other: &OptValue) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for OptValue